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I've got little to no background in Matlab and am needing to plot a simple pendulum.

I have found the equation of motion which is q(doubledot) = -(g/l)sin(beta)

I don't know how to go about this?

After declaring the variables:

runtime = 50; %duration of simulation in seconds

g = 9.8;

startingangle = 20; %starting angle in degrees

initialvelocity = 0;

length = 1;

How do I go about this?

Does anyone have any good tutorials to help me out?

I know I need to incorporate some function called ode45..